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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '153476ffcacccba42ec8541e142eaa921a6eccadc0c1afe9cee13cdd13c1852d' 
  AND token = 'zz+gLIWZkYO6Pi//OlMQBCHf+R2jx1JCQt7R0Zu2VJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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