Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc75e96f6328bd48b904b589b63ed86a90ed4c6fb5bb2b09a2bb2662b0f40ba5' 
  AND token = 'CwbSkKlwsWo5mbHMvmponXhJJ26VuV57av/A7vEw3YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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