Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b50a9ee6381a723fe8e11a90b7951c75e9cd1431a03ba76969eb9ea82d4ead' 
  AND token = 'mgTZNiHZYT74iC4V+VQVGACgNjEUFEoiMEGD5pG9Jnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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