Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c39ce551bc121d6a9e56ca1b5fefd6f48b3d39d91af50d5cbc164ea83ecbe65' 
  AND token = 'cr8CK+7ndJxIcgGEGZqKRrVySqy62FVewt3swB1ncsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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