Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92d66877698e5731b4dbdb30958c2cdddbabe53d557e3ffb5865def2256dc51' 
  AND token = '85mAmc8rFO19ggIGEro7ODSnHDuYmQawMd2xWS+f39Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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