Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0452f3761b997a4401707a19116d65ce70d929098c38485b015b0afa197d8815' 
  AND token = 'zJsYzK4Nwf2LzHPnpJue0kHYypW94crSAq+WAfng0sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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