Without consuming the time I'd take at imps, it seems to me that you have to tackle
♦ now: and they are either 3=3 or 2=4, since surely west would lead one with a stiff, and I doubt that you have any realistic way of catering to a void.
I lead the
♦K: to make it psychologically more difficult for east to duck.
Against best defence (which is rare), I follow with a second
♦. I assume that West gave honest count, since if east ducked the first
♦, surely west has to be honest else east may go wrong.
Anyway, even if west shows an odd number, I plan to ruff the 3rd
♦ (if they duck the first, win the second, and play a 3rd) with the 10. If east has 4
♦ and not the
♣J and found the duck of the K, then I pay off to good defence.
Now, this may look like 'easy' defence with that dummy, but unless one is playing in a known tough field, matchpoints is a game in which you will rarely do badly by underestimatingthe strength of (unknown) opponents

And east may fear an overtrick if he ducks the first
♦: after all he knows that his partner has 2 or 3 cards in the suit.
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari
1♦ - 3♣ - 6♣