SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '779e7433fb8245b6c2a4ad9678f8ab324fb658baf2588467951f1f1367237726' 
  AND token = 'TbGrt69StYuG6BH72s2ClPK4wK30CPIOrFKOZ7J+InI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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