Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668e9b019c177998b750b050652ddeee1889519b1e10f4f1be4978192f2de48b' 
  AND token = '5u79lDQ7EPNnUOlRK2Jc5G7ABVyqDz0fya3UKvIXfiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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