Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0ee2516a0aedcaa74c5c12f7ca151f1f8d6e42049e8f227c61e122373b3d81' 
  AND token = '8iced0vQCS6qC8oF2+lg/nVEZtDSIQtfnU9SZey959Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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