SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c06551c4b8bcffca9022042e3cd339a5016f8db95a9fc60d32ee465318ba4be7' 
  AND token = 'YwQmCvCrOyQQ918ybU9VBvdGDYWbWqqHlXYMPUF61/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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