Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df14d1c6dbf8d91ddb94b008999dc69ab4b297d66f6a515ac59796289ebf5b54' 
  AND token = 'wVZ7z+ke0q2rpajJ7wg5hac1f1oe4PAD0d8axvnWlAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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