Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483f048ffa13bc79802cc1c0ce8e4f8bc75bb5b9c9c1abe578c2b3f573897186' 
  AND token = '5WXoN0oY/Z5VtGanZRj1ECkLdBWk3QMIPJNskaPRRrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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