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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a4306e0f87ff1b7966adf9f61cbf8de560efe76c557e55725ce3710dd52f5a46' 
  AND token = 'T8zswjRR30tHvM1vpU7QyQFh4/0rNfAKpYos8DyHNNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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