Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703356514882e863049686e92b42edddb854e5e44297f987c54adc0942129e3a' 
  AND token = 'hYe6EwXWlD1TZ8/T2ubEArzBibY/ihRfAJ6EsOeVO7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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