Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '425e88cc7fd81d29538c674885eff1d91a702d782e606b572c83594cb619df5f' 
  AND token = 'WJRMGbGUY8p10dWIcj4EIFW2oP/nQ+nQ6mx3pzr1Sqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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