Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df806328bcd2ea6bec03502065dbe33f6b156d0e0b8db622994a034737ef87e5' 
  AND token = 'hDhWVEfZNg1hHymdh+9AeakUyNpSzjUaGkTr4JGiKgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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