Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beecbfa25cb56d99a57388c9510ced25662b89696fb8ddfcdffa4523e784bbcd' 
  AND token = 'OfiGmHnEmSNAktIwoZZHHF2lwleFHcaqLO/PR9JsXUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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