Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6314ba6d3006b57dd18d14eadb6b813738e8da781945a0374bd0502d1475d6d' 
  AND token = 'J/jrK9FTYLxx2mvr20Yy7tgj6Ze12MP3SY+pGuCtj8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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