Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813a9dda350dce41afcdc5c1d591a0851e6da368f9bc5a8370d54935f4b7a204' 
  AND token = 'iXXYU9qDHjiTSrpi9VyXHzTcGA8quVzKT8gthoQxekY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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