Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d9d7f99ba447ec09f546c509233da1e8be87f00b3c518d464ddb1dbcb08aa5' 
  AND token = 'QR1UAyT/plBKhlSQu/FIHsoNNoE9uqmIIGLBQFYcrnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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