Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2421de50e0595b3accbff57aa9f778502315718ce5fd6d37c2c5dd7797c4db' 
  AND token = '6Hel9fo0HmI8dbQYjeekaNPc1a2dIL6mQKbI6KqL9DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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