SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '43e1fb62633628aee111d183193dd4a6eb35e0ac2a8006992ea4c709f0b976eb' 
  AND token = 'wKHftQyOxS2R0+awyBVzAP9CNVgh2GSx/644KKlzY84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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