SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '494d226f66a7f42a67d8147543f5084ff309ed601051c8a74b2dbbf742712063' 
  AND token = 'ZZqKkVUNg2CbloDvEhKr5IpSTj1XXyZbTKSR3M4W7+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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