Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcaeaa1fa31e46ba9e2cbf76d60a9bcbe1f5d94ab5cace89ff0f30a8a493fae' 
  AND token = 'UkspIBf31ARjEpji9wyxNJ7UmTrZAs4uarcwgha7YmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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