Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790a864d4f701381c0dd11c7473fd0a1880c4c327ee7a9738d31482f6a539c29' 
  AND token = 'qTQg4NZRodxz1ty9FvOq7ZqzPqIm86ez+lprSscDrYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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