Hi Kuken
As None888 said, it is very important to understand effective stacks, which is 11,87bbs and not 13bbs in this hand.
As regards to the spot, KJo is a snapcall against pretty much every range he could have this deep.
What range do you excpect villain to have in this spot?
If we put him on a 33% 3-bet shove range, consisting of: JJ-22,AJs-A2s,A2o+,K5s-K2s,K5o-K2o,KTo,KJo,Q7s-Q2s,J6s-J2s,T6s-T4s,T7o,95s,96s,84s,85s,74s,75s,63s,64s,53s+,43s
Calling the 3bet with KJo is 2,33bbs better than folding, if this range is correct and not to wide (Let me know what you think). Versus this 3bet-shove range, the border of prifitable calls is hands like K4o, K2s, T8o, Q6o.