Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ae67fd23786d8e0a11ad182a911ec8fdb6c3f407e3e0b9d22dfddd10e6d768' 
  AND token = 'D5xLKtkDphLOjcqzwwpjyG2LJF26c4AjzFbhxjwZoQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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