Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa35ac9bb8f3c0063f92a6f5d03aea8498b29a06e044dc22530f48c66582c59' 
  AND token = 'E/LjDZ5rLIQAYiY7MDrPnA75WLLNEIwM9DDdj33uLK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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