Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db843dfba9bfb35d1564a645a5682e4f06dd9b9ea656ad8c609a02c6ad66f424' 
  AND token = 'qX9qehM+6XA6P9b3wJW1nEoYWiUI7WYQQyaAi4cAiJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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