Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9f7829750e4cfd3f6a53ca0661d7833c7d1b9a12b9adc22e9056e1df8dfbe3' 
  AND token = 'fwWNgvW+B47J64Rgsr7aU9c5LQ9tYltUINGknVLlIy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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