Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53304984f6729ef893e39a54100ad40b167c9382c5bc6ca1e14a4dc38dc0ab21' 
  AND token = '3+QN6Z+NKcvz/w1egEUmMUTBgaC5cCkRksab1YN8Xvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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