Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de271680987b887c7aa9a897cf7b30b556cf6a4845043e32a4f7cf8b72cc7acc' 
  AND token = 'vK5DhQS7tjmoaf6YMnd+s7W2hcwJR/iRjJpp0mKnvqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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