Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57bdb57b696a3e419daf4f87721ceb689fb534174e729b15d3df9bc29d083011' 
  AND token = '9O6AmlekPqzidvi8kx4Hfk9kolu3w06B0TqR87i2Mw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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