This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The historical origin of 匩 is uncertain. It visually combines 匚 (box/enclosure) with 㞷, but the exact development is unclear.
Since the meaning is uncertain, focus on the shape: a box 匚 containing a sprout 屮 over a mountain 山 with a king 王 inside. Picture a mysterious sealed box holding a royal mountain sprout.
For キョウ, imagine a king (王) inside a box (匚) shouting 'kyou!' as he tries to get out: kyou -> キョウ.