Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a753aa150d7b8e44624d8626ffc2cbce59396d063c88b2135b61b7a74b0a46c' 
  AND token = 'Auec6dA9R1ojm3D18nkxM2A5/KnwGcSIWGo7uhq1I8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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