Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '56d7210be3012ec1b35312196dea496e891a739882edf70d0d4136fa94eda4cc' 
  AND token = 'lULoAecAMSFikjODWsh1ZHclalYIn+PE5QwI/ODtBPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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