Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '73c9723aa539334bec2c8cb789ae0f5c9ed9b7e960985d15a1b8a24942bfa4e4' 
  AND token = 'lK/UOOi7kaFmBpX5rsUG7x84ei6JXL8lA+Z3ns9gtGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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