Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3bd6180fc3f7fde83588a579dbb82b69004895c0be039b1acc9ae5aba54f34' 
  AND token = 'pwxOnxXDHpAgYbsMSXRvYYAIxMNiCUx4qWuI3h059Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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