Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ed9db144db5a8afebd139d9a8045dfab16fd79a33c7d0ed31980809be7a662' 
  AND token = 'e4JVOx33Nz4EahZuNfL5iahy8u3Yi24bDExh0EcwwV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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