It was zoom, so I didn't have any reads. Is the pre-flop call ok? I'm thinking that it might be good from a GTO point of view but perhaps at nl2 people have a 3bet range that's too tight.

And how would you play after the flop? Would you bet? Given his betsize Villain seems quite fishy, so perhaps he would call with quite a lot of worse hands. I'm just not sure how many of those worse hands he would 3bet with. I think his most likely hand is AK, which I hoped would bluff on later streets. My plan was to bet the river if he checked to me, trying to get value from worse pairs. If he bets (a significant amount) I would fold if the river were an ace or king, but call otherwise.

PokerStars Zoom, Hold'em No Limit - $0.01/$0.02 - 6 players
Replay this hand on Upswing Poker

UTG: $3.37 (169 bb)
MP: $2.00 (100 bb)
CO (Hero): $2.04 (102 bb)
BU: $2.09 (105 bb)
SB: $2.01 (101 bb)
BB: $2.24 (112 bb)

Pre-Flop: ($0.03) Hero is CO with Q♦ T♦
2 players fold, Hero raises to $0.08, 1 fold, SB 3-bets to $0.26, 1 fold, Hero calls $0.18

Flop: ($0.54) J♣ Q♠ 3♣ (2 players)
SB bets $0.02, Hero calls $0.02

Turn: ($0.58) 2♠ (2 players)
SB bets $0.02, Hero calls $0.02

River: ($0.62) 4♣ (2 players)
SB bets $0.57, Hero calls $0.57

I certainly would raise this on the flop in position because minbets like that look like flush draws to me. I would almost treat a bet like this as a check with which they're giving up the betting lead on the flop and condensing their range. The hand's also easily strong enough to bet for value. If your opponent had checked instead, would you have checked behind twice in a row? Surely not right, so I'm not sure why you did such a play here.

And well, because these tiny blocker bets looked like flush draws to me, the river should mostly be a fold if it hits of course. Although I would not play it so slow in position to that point.

I'm not comfortable with your open raise size preflop - 3BB is standard for 2NL - and when you face a 3bet from SB, that's an easy fold pre.

Furthermore, I stand with dknt's post about this hand.

I think that your RFI sizing and the pre-flop call is fine.

Flop and turn - raise here against these min-bets. In my experience these are block bets to get to the next street cheaply on a draw. If you have decent equity, which you do on the flop, IMHO you really need to raise here to deny equity to draws trying to get an (almost) free card.

Probably need to fold river - looks just like he was on a club draw, blocked flop & turn to get cheap cards and drew out on the river.