Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8709ef4696610cbd1723bd60976ea15965dcb962e104f3a96dfd67a72120ee51' 
  AND token = 'q70QFA/obrmpW0aZUrksdN+D7t7dBwGpB204fXyPYzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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