Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48c759cd7b9f47f730d8b439ba999f7ee0f4e25f693a1cdc6f2afa570b9dc6c' 
  AND token = 'Kv7Y7zKbK/iKEI/veY/6nnSkUs+Zeygugd4SESWbKPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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