SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '897b29de5b9cee09171c1452ddae0bc62f27bf799b85d268da69387809bd5bf9' 
  AND token = 'qdKDo/DGP9pzKLSXmrGxe5+iGhJZTXk+p49HdGsVNu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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