Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736cb47d406e43653408c481596aba241f0e3b55e2c7abaac76c1635a9a8b145' 
  AND token = 'ik5k5WVTrHW2PSBXK+V7DRVy2rmSQkgIjkM4Rj8T5/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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