Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4300c6c74dcac7bf2b673f7d918e5800114fe278f3ba4ac9c0e2bbb3b00ce952' 
  AND token = 'yVbgSzsmDIPIjZMqnVnzpUMHhwogRWcGTtPwk3MlOsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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