Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b05bf79b57ea76064fb4e359dff84709c9fd637dfdb959542059f3e89668875' 
  AND token = 'ZD1lFEYvBTfYlIf7BhG+ePnrr9ZSQd/eUiB2oVYXVnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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