Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78a82591a209285c02ea77abc660ef1c232f2667d6524a4ad107e3291d6cb1ad' 
  AND token = 'UkbB4mPgcLDfQfPXCI3ngqcpofAElnrepmxWgc+bz8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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