Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af2c033455acb4bffec9a0ff2afaedfabb25f0b8c8db7c603dd725f7c2da8da7' 
  AND token = 'wIwz/ucPj5fQuDtt75nTXE9RzeQtl0CR/yF7HjMZhaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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