Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e41c41c33801099fbe91a67303bf181397df41f58583183bab0b2abe868975e6' 
  AND token = 'WrjTrEGrSkUXgydU6QVjmHj2nsg4ogTsuRWVZjDiezw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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