Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea51551daf119fc99f56ed12beca73160592898266918402d9b59613eae7ded' 
  AND token = 'dfVYPb9t4soVyNxAADC7RtustFdYPrGZc6b+ewl4ZWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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