Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faffaf72fd0c9d020df8fce3b96995acf9d089fc5f6759ab8afe022a239c9b31' 
  AND token = 'SuK0hTmE5JMW2r5UKzFXrUi96nVXqKm8iOs8klC/VRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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