Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd3cd9e0d92706953bc6851e2b062d128997d11ef9dd6fd7b7169b1c42976ca' 
  AND token = 'U0+aorCwn+Hj4ilmNReyW+rf55hJFl/pIXI3HTxW1rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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