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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8bffeba8cb737416b41b9b904163559d1548fcfe0c6ce74d2de9e8c4ce8be4e9' 
  AND token = '/sW3P9FpR+5gFFhx779WcUFFyutm//jtp0b65mAJM+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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