Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536d6597354c71958543a1c4455b34cfc241ce6591b67e8cd6bbee8e76c58642' 
  AND token = 'ZZ1ulqNxKcIjI3p8DGiw/cBSFcWm7rF5UVQeZzsJje4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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