Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3d191b01b40c9eb834840f5ee59452bc83079adac0e08f0477a6cc5c2a4859' 
  AND token = 'KVbMXw/CK7XpOKi/HiogG5dwdfbG7oqcVuc6F2hIvg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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