Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45c47a39453855a98271d08baeb448762f6cda77d2b38044a278045e500f1564' 
  AND token = 't1k0vdWOKQv2g6m5q9qhyd7EVSW7kGr7yM2RbhBHc/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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