Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbb5e6c1ebff8c5520e773a590cb99b1f1a8a861b66d01d11866f6d7d5e2ed5' 
  AND token = 'rTNZbwulZ9pGrO8MIhDBxBmDZMvubFX66TlOXDANq2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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