Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629f1008782e473d4f294db5d50ec640741f632b20064ad7a6dd58f27bbae657' 
  AND token = 'bEvXznUHtkD+bLzPb9mMtbxbrolEDXN+81ywoiMbgIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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