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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '328d7cba0b41e4098ff4db289e17ad2de3f177e5cd25f8e1598f9d0fcbb17e96' 
  AND token = 'gGqMR5Amxi7peEB3lViSY5MPtiJXQPk7vYxNuT4a5Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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