0x3593564c?0x3593564c is the function selector for execute(bytes,bytes[],uint256). Uniswap Universal Router command batch with a deadline.
When a transaction's data begins with 0x3593564c, it is calling execute. The selector is the first four bytes of the keccak-256 hash of the signature execute(bytes,bytes[],uint256), which is how wallets and explorers work out which function a payload is for.