MySQL/MariaDB display data from sensor not available

Configuration
1

Hello,
I have MariaDB database , which I collect temperature from sensors in my home.
I did configuration in my configuration.yaml

sensor:
  - platform: sql
    db_url: mysql+pymysql://username:password@localhost/temp_izmer?charset=utf8
    queries:
      - name: Temperature badroom
        query: "select temp from alibaba where location='parent-room' limit 1;"
        column: "temp"

check the config with no error and restart my Hass.
After that, when i try to add new sensor in my dashboard this sensor is not available.
Can you help me, what I miss ?