Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a13fc72f0f75b196b5098160dbf4f015070c929101328af4110c64e29377b58' 
  AND token = '6VtkCr7hqA3NfcvSwIDZ+gJduSpqU0gy9kUkEASPP/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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