Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90768823c6fd84d5b05bf263748e9cf02d642ebe8ccc27482eb2e15ba037ab22' 
  AND token = 'rZrO4gAR9YvL9b8EJSQGlQKOs3q20fLQATID/47tX3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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