Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c8fa6174f0a4d6dc193270d6ffa9eb6737ef5f66e62e3e44d7e58cf78422db' 
  AND token = 'jmPf/r959xaWU0xBlFLrU0qpZWIcXhnZoV5s4t1zrHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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