Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b741c0becfeb0f4950ff768da1b37eb117576ebf85d1b2c37c236053f1ca845' 
  AND token = 'EL+WzIQTF3/WlTKFhb3T6kciV39Z+2CjH0Hd9KDsvsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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