Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c26d8c0d32776313ffa5440840271bb76e4fae7b25c122adee651c84e118e0' 
  AND token = '5MOo86uN9ci1koUqsQfiLWG+rEvvkHTlnoRv//AIZhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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