Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbfe46f97bf5b6fbc92eb242c14b8d8d6b6efb5fe06ce95f3e5373dab214ab8' 
  AND token = 'EFQe1bG8sp/qmQ4uGg8BsQxZ+T18evJzsZ6DUcqD5/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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