Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300296eb99531d74968f61bdd2f3c97df2c91a4af93a2bbeab5ac4cd75c7e68e' 
  AND token = 'nszQnKq5n7JVDiJCbW6lf2hx7nf9yX8JccddV6kEVMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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