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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a311d041e9e8f23608fc07b7df17be596f8a57d86cd5c387a8a2365ec08fad26' 
  AND token = 'fv7khnN1QWy+LX1euKT8SdtToQK9Wi8e5O4CNW82Yb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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