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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a9ec737a177df0558e72674a6762e8dbe6e3f7d7373ad5c4a43f077a55d51f65' 
  AND token = 'WkEdjehWPnOG7WUHQxLB/8QB2PeJ35D+gK/6EPGg4/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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