Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e824e0aa1999f3cc11fe070e8ea9a943330a92b41d50b17408aeda4bc9b62b6' 
  AND token = 'NpN8D9Gl2B5TsikCrcLcbsOydoSu8NbP/D4CDbUfRqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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