Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f067ec882af15fe7e08cc51bf79f815d80dbf8b3b019b76fd66bc38a79995f' 
  AND token = 'RZP/kwtrRYfDuHnhTqDVNp0+9/KPkRigd+kU0ByqOyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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