SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '88fda7586d5f5d0ed916bb7f71724ed5ce0917873136cbe0f01779365d19ac4f' 
  AND token = 'MZrb1jBo/QlwCI/175uxGqGVzHf8ZGblDYBaQVkU6YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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