Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe85f9a0dccffa5ed38f62c713c753cda016d47a3e4064ab9de59c15ba35d19' 
  AND token = '1RlPDy17QpG4SlN+6OBtJ7CyNqxKfp/UawWpLGTctAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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