Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e89b520cd1905b99716c49d490d3d73ec383852ebe8c91607acb8933f537353' 
  AND token = '1XeE6HiqO4h8rGgWc3fhafnguyiMjWLmAslZFjCWj3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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