Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0749474d3e4f2b806572be2638f7afe5d70c76070fdac5d749c50d207405ff6a' 
  AND token = 'r0IhUxSn4MrjNzRa+ppJEFDBbXB4cxwEDrOvdyaRp9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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