Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef918365f361ca55a93f294d22c811ac27fef29a82efed7d669ea771701f731' 
  AND token = 'eviMI97IPWqLwuPRKfhuX/LTKhxj67YiSrKnOjrVMS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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