Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6f06fe653ef7d5df8309c6dd9fc05a491b5c84865d55b78fd34a471eef00ab' 
  AND token = 'fc3+02DLMAyCwxZTBwySqEYJXjskMpbUl04mgbsBZfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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