Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93a46de9fbcdd70ff42200d1eb8ac80787c06211c797b2a025c6a84abb0f31a' 
  AND token = 'MnzAHf/QuJzaVaA2ry5+W9DFQZmmacmG3xsYt3O20pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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