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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '664db88124cef849e4d136f08f4ebc1e2ab282a4b12217539be3b83c93101c36' 
  AND token = 'Ik9joVCp99A9ZXlpKY5FZsj+CtHhqKvC8AKk8tk2+2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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