Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735892026fb08f7e292461529452b6c28775dbeec72a8f8fe2a5cbb349f9e97d' 
  AND token = 'km4PpsWEC9i+ycT3pWOUevie9ijmeaTj7AsJbk/0EqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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