Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46557dbe36c72962316ade8accbd564e0998aefbb558c76187442d7781356cb' 
  AND token = 'JcjEkI6+j6PC/2hExt/1hYjTBeNeunym5d4yzmZvzes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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