Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d7cf8a8f42b15c9906365450017e3e5729d394e49255bf75a4730c30f54699' 
  AND token = '9b3tdD8azPB3lNFdSXubGkWV9WjIaOyYNuPyfftFYkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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