Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75c14c9bf6f6949630a479a3c20de1ab2dbec9c473a0be39d104adf325af4c5e' 
  AND token = 'ydFcxn8IDSNR5blwdlrVGFV84TTOXHSYkQBFVAKUoRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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