Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd313863fcf9d8409680f9b4b3f1157f7e114b8c7e2c7f62b9bfd1e7cf8e3016c' 
  AND token = 'LG3hjKZXBRyaGvaH3mvCSbe3Ai/n+2oyhpTf09jQ8aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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