SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fc79b1bed69e3cb0e86d8fb735183696bc7741818107168df1e7b5fbebbc5343' 
  AND token = 'zzkohHHiajdJlMqCbHZU3zfpIBI05RvXDsCAFVZVaSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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