Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068ae03fe6668a88a49a888bb7518115d0d1c7edf2d24d14fd2a84bf77490f46' 
  AND token = 'hTJeMbDfe9MpNeNJ73Jbd4B/MVqfhh7mhFaXth5scww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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