Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f525d5d686a78617469b5d7086a89a02df2b45393c86d8ee6c936ca7746032' 
  AND token = 'WlOFCQ2jFDgJ8N/N1z9lWPk7SZ+bEt2RdsT/wXH0CaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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