Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '983df53321397057fc18ad26bc2b426d93e7de5b157c71ac128bebc06c28dac3' 
  AND token = '6IxBFHFZtZT+ZwDCoiWIFJrXuztI8BAWZUcNkwEjj+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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