Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c27e39506685637608ae2c62331d3e3cbc66349578c6fc23059cd031e811a3' 
  AND token = 'r1seLgKJ46wv1qLLMKETuX9e438Z/TlIPsuC+B4xWwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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