0x6352211e?0x6352211e is the function selector for ownerOf(uint256). Reads who owns a token. Read-only.
When a transaction's data begins with 0x6352211e, it is calling ownerOf. The selector is the first four bytes of the keccak-256 hash of the signature ownerOf(uint256), which is how wallets and explorers work out which function a payload is for.