Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321d24b9a2d4fb253528b5e32072c2c3839da00dfedd56136720d5e31d2812d0' 
  AND token = 'vLKyq2jljDhhe3IFX3rGMOOIR13dARRk+OY0lJTnik4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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