Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40b025bf967e1f2584b0abd27c4f8166e2f5071ba418dfba0adcd22279606db' 
  AND token = 'yqrwDQAt2tbSzPMAsYVCJMfClh9hxZaAIwJkJ1idzMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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