Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3815709183c9e15b0fb129687d90200fe43938f60f8c42cae7cabaaeef1b67' 
  AND token = 'fMwAhRl+6BQp7y1xv5tmY9ZI9NlrdK1y5ArYi+McXuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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