Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debc477dcb49bf92589d5ac3f1ddd68049d1af8fd0e2400abcdabc35d3e5a589' 
  AND token = 'djtspOXxfsHZBBNk6K4UAPkaFjrWMl7fAPaQOoeQcfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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