Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ecd86f12960a8ae35325f3b3bfbfc6cd2811d884da55dd2b3e33cef2924239' 
  AND token = 'RSlrobHhwekPDiJF9lkX+lqyrjYE2Q1UEdMGsMWSDSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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