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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ca48e1251c914ffeb8e5fb7297027ca704ea324adb9d193d03ce8d8c12d12d9e' 
  AND token = 'Qqn0jOhBVMzmDrfLW40ql1k9TxFooGSxkYin0+JS9tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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