SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '06e3f10dc79d971376db2f3f7df99504a3b7213b8c5a0c5857f25feb625b3eb4' 
  AND token = '7WC0VRNCJ9vJzP4xiWl5vGqpDMnLz5kmknwo0qtYX4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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