Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256ffe489d140d9d19ae3ef7726377085bb37401fc38443ea5b1fd5ed7a92541' 
  AND token = 'hu0lOwutxeeiG6NvNOzyvOmUU8/EiQOTINWuZ0GDCOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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