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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '06d8804ddc5907445c183d196a90c56af6377c5e8f1e4c809eb5e01a45310273' 
  AND token = '3jUu2eVKlylruHPccyX5hbBvIfsoh2UHBqEocSsedwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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