Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523765670fd5ce8955e17b3f8747d274dc49093ec42d20c51435b1c576327cae' 
  AND token = 'JhISP10+4Es8JsOh3+U7RJL0c81eQtwvcOwIks3GgOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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