SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e4050839b03c43d7121c893740c898e5468b458764fc5d7eec8381ddb0f141fb' 
  AND token = 'lwrQwCGzDh1QMTxn9Ss/4uhK3DQVFdBGWCIUPuNOCsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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