Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21f7f754c91f3a1e599925a5be24b4deae737200a0cbcbf2b56eef6eb1e8f232' 
  AND token = '8sj76J0RsLAYsVsuk3J/Gj7XumoM2CtVT+hJRVqSU/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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