Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b7f44f8016e1912fab99dc919c04ab93e3fb573f061352576f8a5b6c314f6f' 
  AND token = 'kwS5v/ur1BgttRWuOFEQrGfRP1iTyFkUx5pw1sx+BMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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