Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c7932e497065309cdc84b9f63f532a6b6c61fcbe000a7c309d9ce63ac77468' 
  AND token = 'DM3Rs9XgvWZPV6fxOpSM37G2B2m+gKxCOaWiRNYeM80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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