Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed20d1508ccf8aadbb6d25ae9fe39b2fb89c19abaf3e1ec2509a7cd9083ef0f5' 
  AND token = 'kMxrLDS09HcpVYyKbGsrrzwtniUWOK/kF342qEOn9SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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