Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7783ad795f6655b4ee17e9cf5612b62a03c9e9f02ba0795deda01e326a8b38' 
  AND token = '7Zi5CLJcQUOjQcyQruaAI4rmc9ETgtg1Z6wFTCn5984=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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