Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0bd91833caf7dd7787b0bde8a8b0ac86078945e15f71e500da2f36102c2da1' 
  AND token = 'RnZeb8WMaS70wXcp7LeFG/rZ6bj8InGeyc0rAmFmlJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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