SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '078872dae1bd7c3a1fbe47b737d3c51d79082d36745659baad0cef692cf2b829' 
  AND token = 'EV3fXyrmxAD3lv5ImNQgGrxrQvWZBGCzXrWCNwkYn0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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