Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4900c5b3666feaf22e968bb4f7767c5a88b4a704de59db65aa4fd0bd48438e03' 
  AND token = 'Ja2bwe/uzq4ibWQAgfCm5c5IohV/LOH2VE0jYo9M9Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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