Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947f7fb1c80cdec62ba1ad2e3dcedd7e89daa19f4d9f1de3846569af134c765a' 
  AND token = 'BactZDbJux/le+Cx9NMwmIAhxQdiTMkJ4oh49bu4x6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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