Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac7026a1b0bf82a5e3cd79850a4070d85b62dd558917114fcbfcee8a2b5b575' 
  AND token = '9/5+uX3IvvJ6lNU7FC7OdIRPqcmFfgWJ8/o9JQjjvtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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