SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9da876cfa6f40972fda9ad9a7b57742d7ac668326f57838852d62d12511467cf' 
  AND token = '5jHgfhkXVdawdLZo006qm5rC2mwvFqTK7nhraGzECzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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