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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '55105f8fd4e5ebf192adfdd9692ab683a94310ee7821acd4c25909e0f058174f' 
  AND token = 'WVGuajXOET0rZVZlXrdSxJE8BlCd+xEqlC5E0dCj+0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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