Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36849a49b21b67fd94b6b2ca8b8cd4c213c546d5162df2dcb401ab42f6f7fca' 
  AND token = 'KcpTQkdfZ5ExrVAYhy2O6vtpMUKR9WmqqUGvuC+t6RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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