SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b62152164a9e36ebe383e174573dfb4fa38fce300ec1ff0e82614e7f4433f41b' 
  AND token = '1GXzKYOjQO6O+O+UL9McNamWHGFJXvFaB+lVziiZT2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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