Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ec50a7d2563eafb3611850fcd0a8e474d38a93ecf247b6cb2488bdea98c8c1' 
  AND token = 'G5GwKjOx1/yU++sSuGycTL1a/xFeWDzuAKK44nk8wBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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