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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3e8c42d4f3b53743b2ce558bf7ec8c59c20468363eb26fa67053894962a0fdcd' 
  AND token = 'k3vtfP78JZupmAcof0v4LG7uP1AMr4B9XqHtV4e8q3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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