Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df3d137db57bb30b821ec98c4d2cbc1ff3f0e818b054a32e18f1f42ebd4fdca' 
  AND token = 'WybXdui+4ECiU2tgybyEVyXsj7JyNg7OmHa8gVfctMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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