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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c924acb77982e1c61add08ad41f9317589ed456c975a377970c2fc7fcec2d0a1' 
  AND token = 'PAGi5m7PoEprH4xAACty9RtE9WRcY7EBzMmDeqRLTz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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