SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3ea2dde7aaf6f7d8482a43710dfbc44e1dd8d911dd20b82f236dc46721e06dd8' 
  AND token = 'L2eCowBqZF2jg2gj10iej5v4Vmf5KEDmLzx+w0hnXTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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