Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c9ecf5ed0e3b863cf56a8e52304d8b5f2a4bdb6d8eb56d9890b1d37a9f9bf5' 
  AND token = 'mnsLJN0XZxEXZbHv61FXCwaAeX2FLMMrjE7hSZzkDmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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