SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3aa970c0552b7fcb0f95a3a5074f3e49dbddbd300093d9b181b1fc96b3128f6a' 
  AND token = 'LsBnlET5BMeKWsBk6ueA4hFDFHZ71h/nSR1Jq/83cKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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