Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1255fef9fc6b61b673559d8811ff8a5cb77bdb7fddafbd3c6a867c1ab5392f9' 
  AND token = 'MSuiRGPj5zJ+ZC5ofOVEg1smPo+VHq6IhopW1O3V9us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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