Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81efdce8fa4df6591b19673d098e2e2965965ff82bcb93c28a7656176912f658' 
  AND token = 'QtTrSi618LT8HwHykDsWU/H61G8zHWCX3viEenfjs5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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