Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89fd1e48cc288a9cbed972e948263f6ec03501eebc8089a6de735ccf36c34540' 
  AND token = 'O57veNiTwOGvZ5i60U5bSVXlxx7O1zyALXFQsKz2s4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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