Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347ed8395e8b8e64fe8435953280451241022e4029adaba514ca285100bc5b65' 
  AND token = 'L8QjqFnWwRiEsgyl2OQs33sismP6CbMFCvyW4LhPbGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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