Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9b574005e0b7e590196de60d35206ad8ac167ea6b8b8c78f0178103aaad246c7' 
  AND token = 'ZLsU3U+C+UUWlDPZQEa3xiZ0jlfkrBCxEZylllnyWNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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