Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6cd5580e9809eedddf28a1852c19e2cc690eeeecbf90b1a0036bfac094849062' 
  AND token = 'UZ7rGYbgIHHBYb8J+QFSVh9y5hxWLs68U8NLVHwIskw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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