Small Bet after Flop

Situation:
Tourney (small buy in)
3rd Level
You are dealt KQs
Position is button
UTG raises 3x BB (similar stack as you)
you call (should I have raised?)

Flop comes J44

Opponent min bets out 1/5 of the pot (very small)

Do you put him on a monster or did he just miss the flop and he wants to try to purchase the pot with a min bet?

No read on the guy up until that point but you have not seen him do anything funky

Hes either got air or a monster. If he is a complete station I just let this go, as his calling range is stupid if we try to raise this flop. If hes not a complete station then I will pop this sometimes.

call