Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5d85630dc6f93313cd2ac2befb5f1f8dbf029a8819e38e4a8254020668b7b3' 
  AND token = 'WsswtCzRkidF8aDMYrOXQmScUgjpNBUpBS3crk7eUvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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