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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cd40c43fbe49b80908724bacc4908642d762492428bafd1b72338b509807be75' 
  AND token = '3AUWLd1WM8kerH67AG1K0fm7A8YWl5fHk35eGw5jkeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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