Or was this right? Maybe check/raise is better? I could afford to trap here?

PokerStars No-Limit Hold'em, $0.25 BB (8 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Hero ($49.30)
UTG ($26.55)
UTG+1 ($39.70)
MP1 ($29.95)
MP2 ($24.65)
CO ($15)
Button ($25.90)
SB ($20.50)

Preflop: Hero is BB with K, K. CO posts a blind of $0.25.
2 folds, MP1 calls $0.25, 1 fold, CO (poster) checks, 2 folds, Hero raises to $1, MP1 folds, CO calls $0.75.

Flop: ($2.35) 4, 4, 4 (2 players)
Hero bets $2, CO folds.

Final Pot: $2.35

Results in white below:
No showdown. Hero wins $2.35.