It needs scrubbed with 10:1 bleach water. If possible bake it at 200-250 for 10-15 to kill bacteria and bugs that remain. If not isolate the wood by itself over a heat register for a week or two. The bacteria is your big worry here. I use natural wood in my enclosures too. If i cant bake it i dont use it. I also spray Reptile Spray for mites on the wood just to be sure. Your snakes health should come first.
Btw: pouring boiling water does nothing. There are more nooks pores and soft spots that bacteria and bugs can hide in that you can imagine. The water and heat will never reach these places. If you cannot fully submerse the piece for a few hours you defeat your own purpose...