SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '315895fc39f9c0e175f702e08f1ba9e88a9cfc56d176752f097c06283589ad86' 
  AND token = 'bhv6ZYXqe2v8PX7cTBB17Hm3yg44q3Qp/xM5sDWOqfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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