Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab76abc17647242d97fe6df2cb60e392cb163f0bd1d2a540cdf0d3e12e72a365' 
  AND token = 'HvQmakrnzjg1OjymttzB0jrl9V+YnlRw1wzzsFbb8KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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