Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21bbe9cb495dbcba2c3ffd421ebd0a0585beb1afd7087326c9e2c64eb1cee0ef' 
  AND token = '/BKmU30SrucwhHgQnE6kd2V9BkakSv1JC419ftumvVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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