Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4e35e7ac6b5c35def200bff829b4875ef08771af5c6c49ee5f0fff2934604b' 
  AND token = 'HEYpH0ji6pdMnJ+vjZVzg4SAwzBx9v9xvv130sS5QfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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