SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '07077de9cd46a72984eff0c5a84e5653dc36264008b8d8bad7a2c768d8a03668' 
  AND token = 'TMp+gX5VXi99hxfrl8zpguyF/vmWarCUOFlKDHPr/VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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