Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94c99448d0c1d10c82296c343cd25e1ef716bee16643aeaaa3909d21e214f21' 
  AND token = 'ZnEnD+FYa06WMqqVSVuwjpUhLf8faGUmkOE1OTgOmw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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