Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7296b8e3540f5ca979ddd8e88d8982f1cc63ff0b063d02266881cbf0924146a' 
  AND token = 'sX+VdrBu9VSlIGVSlL7VSjXrBQNdWD3aGoo4sIo7Xc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}