SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7760a860fbb07ffe927d30d9dcb2957e1bbb62220c3a54bb2ec272d4e5c1fb38' 
  AND token = 'KoGWm8h3aVG5mWgzj0SvaHSs5i98TmFu1onYXSWICTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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