SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '72520c4f6bba01d788b74fed9a14a1ef06d97572b97a152b8d15847c154bf36f' 
  AND token = 'h6Z/p0/A5TC+mqFzc/bq3+W/6cJw0Fri1wCydedeC3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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