Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea4b756e4bb7a3f3b6adb527eba86d31ddabd2688146eef180a0d9f792cf3ae' 
  AND token = '8cKhwPYFoW2MIGsegaTZiF8OTKHocd9ptUHRxowK22w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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