Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d83dc61ae7f2be712d3a7bd3ba57496b9ba1231b989c4cd20c241e054f13303' 
  AND token = 'b4cOA1WFD+knUfofJYJOFA43qthx0JM6QJn5uvkX7hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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